Improvement in locks



anima sam sind @time EDWARD VOIGT AND PHILIP IMA'IHES, OF PHILADELPHIA, PENNSYL- l VANIA. t l

Leners Parent No. 101,684, lated April 5, 1ero.

IMPROVEMENT IN LOCKS.

The Schedule referred to in these Letters Patent and making part of the same.

We, EDWARD VoIGT and PHILIP P. Marlins, of Philadelphia, county of Philadelphia, State of Pennsylvania, have invented au improved Lock, of which the following is a specification.

Our invention consists in the combination of a `thumb-stud arranged to rotate in the spring latch with a stationary pin on the lock-case, said stud being so slotted or grooved that it can be turned to s uch a position as to either pass or be arrested by the said stationary pin, and thus retain the spring-bolt in either a locked or unlocked position.

,Our invention further consists of certain devices for controlling the said rotating thumb-stud.

Descr-iptio-n of the Accompanying Dra/wing.

Figure l is a side view of our improved lock, with the cover-plate removed;

Figure 2, the same with parts of the lock in diii'erent positions;

Figure 3, a transverse section ot' the lock on the line l 2, iig. 1.

Figure 4, a part of iig. 3, showing the key;

Figures 5 and 6, detached sectional views drawn to an enlarged scale, and illustrating the operationv of the rbridge-plate.

Figures and 8, detached 'views of the retainingdevice, and

Figure 9 a perspective view of the same.

General Description.

A is the case of the lock containing the operating mechanism,.and

B is the cover-plate to which is secured a tubular case containing a tube, E, the latter bearing against the inside of the case A.

Over the tube vE, and resting on an arm, e, projecting from the same, is placed the slotted bridge-plate D, which is controlled by pins i i and operates in connection with tumblers within the tube E, to prevent the -rotation of the. latter except on the application of the proper key. l

Through one end of t-we caseA projects the springbolt L, which is operated by an arm on the tube E, and through an eye in the inner end of which, and through a slot, a, in the case A, passes the stem of a. thumb-stud, G.

In the said stem are cut two grooves, g g, to one of which is adapted the heel 7L', of the catch-lever 7i., which is hung to the projection l on thev springbolt L. v o

Another groove, g1 is cut in the end of the vstein' of the thumb-stud, a pin, j, on the cover-plate oper- The retention of the spring-bolt L in a locked or unlocked position is vaccomplished in the following manner:

\Vhile the spring-bolt is being drawn within the. lock in the manner described, orl by the thumb-stud,

the groove in thc latter is kept in such a position asv to allow the stein of the said stud to pass beyond the pinj, after which it is immediately turned to the position seen in iig. 2, when the stem of the stud bearing against the said pin j will maintain the springbolt in an unlocked position.

During the turning oi" the catch, the portion g2 ol' the same, iig. 7, formed by the grooves y y comes in contact with the catch h', and slightly moves the same V until its heel h arrests the further movement of the said catch, and maintains the same in its proper position.

On turning the thumb-catch back to its former position, iig. the spring-bolt will be released, and return to a locked position, where it may be secured as before by turning'the catch to the position seen in iig. 8'.

It will be observed that the spring-bolt may be operated from without by means ofl -a key in the manner described, or from within by the thumb-stud G. It will also be seen that by means of the latter the bolt can beso secured as to prevent it being operated from without.

Claims.

1. The rotating tlnnnb-stnd G havinga transverse slot, g', in combination with a stationary pin, j, for the purpose specified.

2. The spring catch lever h constructed substantially as described, hung to the latch-bolt, and operating in 'conjunction with the grooved and vslotted stern of the thumb-stud and stationary pin j snbstan tially as specitied.

In testimony whereof wc have signed our names to this specification in lthe presence of two subscribing witnesses.

EDWARD VOIGT. PHILIP P. MATHES. Wtnesses:

JOHN WHITE, HARRY SMITH. 

